Burglary and fire alarm



1953 c. J. MUNCH 2,66l,394

BURGLARY AND FIRE ALARM Filed Aug. 16, 1951 4 Sheets-Sheet sa I INVENTOR CARSTEN d. MUNCH Dec. 1, 1953 c. J. MUNCH 2,661,394

BURGLARY AND FIRE ALARM Filed Aug. 16, 1951 4 Sheets-Sheet 3 I V/////// u, ;v 83

/ X V/ {a d I N n\ INVENTOR CARsTEN J. MUNCH Dec. l, 1953 c. J. MUNCH BURGLARY AND FIRE ALARM 4 Sheets-Sheet 4 Filed Aug. 16, 1951 Patenteoi ec. 1953 UNITED STATES AT'ENT OFFICE Claims This invention relates to new and useful improvements in an alarm system.

More specifically, the present invention proposes the Construction of an alarm system for connection in a novel manner to the circuits of a conventional telephone to be automatically operated when a predetermined condition exists on the premises protected by the system to establish contact with the central oflice of the telephone company and advise the telephone operator of the nature oi the predetermined condition so that suitable steps can be tal-:en to protect the interests of the telephone subscriber during his absenc from the premises.

Another object of the present invention proposes constructing the alarm system so that it is always connected to the telephone so that all the subscriber need do is close a master switch when leaving the premises to condition the alarm system for automatic operation.

Still further, the present invention proposes constructng th alarm system to be connected to the telephone in such a manner as to leave all the circuits of the telephone intact so that the telephone is free to receive iri-coming calls and to make out-going calls regardless of whether the alarm system is turned on or not turned on.

The present invention proposes constructing the alarm system to have a plurality of control switches strategically located on the premises which control switches are normally open and arranged to be closed when the predetermined condition exists for which the system has been designed to set the system in operation to achieve its intended purposes.

As a further object, the present invention propcses constructing the alarm system to have its own clial means for automatically dialing the operator after one of the control switches has been closed setting the system in operation to establish contact with the central office independent of any lifting of the telephone hand set or operation of the usual dial mounted on the telephone.

still further object of the present invention propcscs cons ructing the alarm system to have its own amplier having a turntable drive motor and amplifying circuit connected in series with a source oi current and the master switch in a manner so that the amplifying circuit of the amplifier is energized the moment the master switch is closed to be ready for instantaneous use the moment on of the control switches is closed.

still further, the present invention proposes arranging the turntable drive motor of the amplifier to be energized to play a continuously recorded message only after dialing of the operator ,has been completed.

Another object of the present invention proposes connecting the output transformer of the amplifier to the transmitter of the telephone hand set in a manner so that the continuously recorded message will be played to the operator advising her of the predetermined condition for which the system has been set so that the proper action may be taken by the operator.

Still further, the present invention proposes arranging the normally open control switches so that they will be closed by unauthorized opening of a door or window of the protected premises to set the system in operation to aclVise the telephone operator that the protected premises are being burglarzed with the request that the police be dispatched to apprehend th intruder.

As an alternative, the present invention proposes constructing the normally open switches as thermostatic switches which will be closed by excessive raising of the temperature within the protected prem'ses as when a fire breaks out to set the system in operation to advise the telephone operator that the protected premises ar on fire with the request that the firemen be dispatched to extinguish the blaze.

It is a further object of the present invention to construct a novel alarm system which can be used to afford protection from unauthorized entrance or fires, which is simpl and durable and which can be manufactured and sold at a reasonable cost.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set orth.

On the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a diagrammatic View showing the alarm system of the present invention.

Fig. 2 is a rear elevational view of the main box of the alarm system.

Fig. 3 is an end elevational view of the main box looking from the right side of Fig. l, but with the cover of the amplier shown in its open position.

Fig. e is a partia] enlarged horizontal sectional View taken on the line 4-4 of Fig. 1.

Fg. 5 is a partial vertical sectional view taken on the line 5--5 of Fig. 4.

Fig. 6 is a partial vertical sectional View taken on the line 6--6 of Fig. 5.

Fig. 7 is a partial vertical sectional View taken on the line 1-1 of Fig. 1.

Fig. 8 is a partial vertical sectional view taken on the line 8-8 of Fig. 7

Fg. 9 is an enlarged partial vertical sectional view taken on the line 9--9 of Fig. i.

Fig. 10 is an enlarged partial horizontal sectional view taken on the line lil-la of Fig. 1.

Fig. 11 is a schematic wiring diagram of the alarm system.

Fig. 12 is a sectional view of a thermostatic control switch which can be used with the alarm system.

The alarm system, according to the first form of the present invention illustrated in Figs. 1 to 11, is designed to be used with a conventional telephone 26 having a base 21 providing a cradle for having the usual hand set 22 rested thereon. On

the drawing, the telephone illustrated is known t,

as a type 302 and is manufactured by the Western Electric Company. Resting the hand set 22 in the cradle of the base 2! depresses a pair of plungers, not illustrated, which project upward from the base, to open a switch mounted in the base to break contact with the central ofiice of the telephone company. Thus, the mere act of lifting the hand set 22 permits the switch to reclose and establish contact with the central office all as generally known in the art of telephone circuits.

The base is provided with the usual dialing mechanism 23 operated by a manually rotatable dialing dise 26 to be used for dialing the number of the person being called. such dialing mechanisms include normally closed switches which are repeatedly opened and closed on the return movement of the disc 2& for sending out electrical impulses, again as generally known in the art of telephone circuits. Extending from the back of the base 2! of the telephone ZE! there is a single cable 25 which includes the necessary leads for connection to the transmitter and the receiver which are mounted in opposite ends of the hand set 22. Extending from the side of the base 2 i, there is a single cable 26 which embodes the leads for connection to the circuits of the telephone company. It is thought that the foregoing discussion of the telephone is sufiicient to serve the purposes of the present invention and further reference to the constructional details of the telephone will not be given in this specification as they form no part of the present invention.

The alarm system of the present invention is designed to establish connection with the central office of the telephone company even though the hand set 22 has not been lifted from the base 2! in response to the existence of a predetermined condition within the premises protected by the .r

alarm system. In the first form of the invention, the system is installed to operate as a burglar alarm and in Fig. l, there is illustrated a portion of the interior of a building 21 having a door 23 pivotally supported within a door rame 29 on hinges 30. The door 28 is provided with the usual knob and lock mechanism 3! for locking the door in a closed position. The building 21 is further provided with a window 32 having the usual rame 33 slidably supporting a lower sash 34 and an upper sash 35.

The alarm system is designed to operate automatically upon unauthorzed opening of any door or window of the building 2'! to which the system is connected. The alarm system includes a main box 36 in one side of which there is mounted the electrical parts oi the system and in the other side of which there is mounted an amplifier 31. The amplier 31 is constructed to include the usual amplifying circuit 38 and turntable drive motor 39, see Fig. 11. The drive motor 39 is provided for rotating a turntable .0, see Fig. 3, upon which a record il is positionecl. Resting on the record a there is the usual needle az of a tone arm 33 which has its pick-up connected in the amplifying circuit 32 of the amplifier. Thus, when the amplifying circuit 38 is energized and the turntable drive motor 39 is operating the message of the record ll will be played to the operator of the telephone company as will become clear as this description proceeds.

The record ti has cut thereon a message pertinent to the predeterminecl condition which must exist for setting the alarm system in operation. With the system constructed as a burglar alarm such message might be as follows:

My name is John Q. Public and I reside at 423 Park Avenue, New York city. My home is being burglarized; please advise the local police.

That message will be continuously recorded on the record, M. The record being one to operate at 33 or R. P. M. the amplier will be in operation at least for a full four minutes; affording the telephone operator a sufiicient length of time to receive the message even though the circuits of the telephone company are tied up. When the end of the record groove is reached the needle will merely idle in the continuous end groove until the alarm circuit is shut off as will be presently described.

The particular amplifier 37 shown on the drawing is one using flat disc records; however, that is by way or" illustration only as the amplier can be one designed to operate using tapes or wires without departng from the scope of the present invention. Also, such recorder can be designed to operate with a continuous tape or wire so that the recorded message will be continuously repeated an endless number of times until the alarm system is shut oil.

The main box of the alarm system has a pivotally mounted cover 'l provided to be lowered over the turntable i@ and the tone arm 33 as known the art of amplifier Construction. The main box has a front wall and a rear wall The rear wall 55 is formed with an opening through which the interior of the side of the box which encloses the electrical parts can be reached. That opening is closed by a pivotally mounted door see Fig. 2, which is maintained in closed position by a key operated lock 48 to prevent unauthorized entrance into the interier of the bo:: by children and the like. Mounted on the rear wall :25 beneath the bottom edge of the door there are three junction or terminal boxes it, and 55. Extending from the terminal be:: & there is cable ti provided at its other end with a conventional plug 53 for insertion into an outlet receptacie for supplying the required Voit A. C. current for Operating the alarm system. Extending from the terminal box 59), there is a cable which encioses all of the leads which are connected to the telephone 1 and 2. Exte-ling from the terminal box 5! there are cables and connected to the electrical parts mounted on the door fre-.me Zl and the window irame 33.

Referring now specifically to Fig. ll, it will be *steel that the alarm system includes a transormer 51 having a primary winding 58 and a econdary winding The primary winding 53 connected in a circuit which includes the plug 3 and a pair of parallel connected, key operated i ester switches 53 and Bl. The master switch e is mounted through the front wall 45 of the the main box 35 are main box 35, see Fig. 1, so that the alarm system can be put in operation from the interier of the building 23' without requiring actual leaving of the premises. The master switch 60 will be used in a home for example and is turned on when the last of `the occupants of the home retires for the evening or at such other times when protection of the system is desireci. The master switch 6| is exposed at the outside of the building 21 immediately adjacent the door through which the last or" the oecupants leaves the building, so that the alarm system can be turned on upon leaving the premises. The master switches ai) and Bl are key operated to prevent their being turned on -or turned of? by unauthorized persons. The circuit which includes the primary winding 58 includes a lead 62 from the plug 53 to the master switch sa and a lead 53 from the master switch se to one side of the primary winding 58. A lead 6:! eX- tends from the other side oi' the primary winding back to the plug 53. The master switch Bi has leads tt and 65 connected to the leads 52 and 33 in shunt of th master switch 60. Thus when either of the master switches ti@ or e! is turned on the circuit through the primary winding 58 of the transformer will be completed.

The leads ?32 E i where they extend from enclosed in the cable 52. Likewise, the leads 64 and 55 where they leave the main box 536, through the terminal box 51, are enclosed in the cable 55, see Fig. 1. It is appreciated, of course, that the master switch iii could be embodied in the doorlock mechanism 3! so that the mere act of looking the door 28 in its closed position, upon leaving the building 27, would cause the alarm system to be turned on.

The act of turning either of the master switches BE! or iii to its "on position will cause 110 volt current to be fed into the amplifying circuit 33 oi" the amplifier :ti to heat up the tubes of the amplifier to be ready for immediate operation when the alarm system is set in operation. The circuit for so energizing the amplifying circuit 38, includes a lead 66 connected at one end to the lead 63 between the master switch 60 and the primary winding 58 of the transformer 51 and at its other end to the input transiormer, not shown, of the amplifying circuit 38. A lead sl extends :from the other side of the input transformer of the amplifying circuit 38 and has its other end connected to the lead &e between the plug 53 and the primary 53 of the transformer 57. Thus, when either of the master switches Gli or iii is turned on, the ampliiying circuit 38 will be energized to be ready at a moment's notice.

The transformer 5? is a step down transformer and converts the 110 volt current into a six volt current. The reduced current from the secondary winding te of the transformer 57 is fed through a constant ringing drop &38. The constant ringing drop ta includes a switch arm 6@ of conductive material arranged to be closed against a fixed contact lili. The constant ringing drop 68 further includes a coil ll which when energized moves a metallic core u to pivot the switch arm ii& to engage the contact ?8. The top end of the core 112 is connected to the switch arm 69 by a pin 73 on the core 72 which engages a slot 'M in the switch arm se intermediate of its ends, A spring 'le is provided for holding the core 12 in a raised position in which the switch arm 69 will be raised off the contact i'll when no current is flowing in the coil 'I i.

Mechanism is provided within the constant ringing drop ee for holding the switch arm .69

down on the contact 10, after having been moved to its operative position, even when no current is iiowing in the coil "H and against the action of the spring l. That means comprises a pivotally mounted latch arm 'le positioned above the contact ?5. The latch arm 15 is held in an operative position against a pin 'F'l by a leaf spring 18. The bottom end of the latch arm 78 is formed with a cam surface 79 which faces the free end of the latch arm 69. When the core 72 is pulled downward, the switch arm 63 will be pivoted toward the contact 'lil passing the cam surface 19. That will cause the latching arm 76 to be pivoted outward against the action of the spring ?8 until the free end of the switch arm 65 passes the bottom end of the latch arm ?6. The leaf spring ?8 will then operate to immediately snap the latch arm lt back to its starting position holding the switch arm 53 in engagement with the contact la.

A slidably mounted plunger 80 is provided for pivoting the latch arm ?6 against the action of the leaf spring TS to release the switch arm 69 to be raised off the contact iii by the spring 75. The plunger 83 is projected from one side of the casing of the constant ringing drop 63 to be manually pressed inward by a novel arrangement to be hereinafter described. The extension of the plunger se can be best seen in Figs. 7 and 11.

Exposed on the top of the constant ringing drop 58, there is a pair of terminals 81 and 82 and exposed on the bottom of the same there is a single terminal 83. The terminal 8! is connected to the contact i!! by a lead am. The terminal 32 is connected to the pivoted end of the switch arm 65 and to one end of the coil 'H by a lead 85. The other end of the coil 'H is connected to the terminal 33 by a lead 35.

Energization of the coil ll of the constant ringing drop 58 is controlled by control switches ill, 88 and 89. The control switches 8? and 83 are alike and are mounted on the window frame 33 to be controlled by unauthorized opening of the window sashes t i and 35. The control switch 89 s mounted on the door frame 29 to be controlled by unauthorized opening of the door 28. Each of the switches Bl, 88 and 83 is alike in that each is spring pressed to a closed position in which current will flow through the same. In Fig. 9, there is illustrated the switch 81 controlled by the upper sash 35 of the window 32. The switch sl includes a casing 9& mounted in position in the window frame 33 by means of screws 9! passed through an external fiange 92 of the casing 953. Within the fraine 33, the casing se is provided with external screws 93 for the connection of the necessary electric leads. Extending from the bottom of the casing to there is a spring pressed plunger 94 arranged to be pressed inward by' the upper sash 35 when in its fully raised position shown in Fig. 9. If that sash 35 is lowered by an unauthorized person, the plunger 9 1 will move downward closing the circuit through the control switch 87.

The control switch 88 of the lower sash is like the control switch 87! except that it is mounted on the window frame 33 to have its plunger 9:3 extend upward to be pressed inward by the lower sash 36 when in its fully lowered position.

The control switch 89 is like the control switches 8? and 88 except for the Construction of its plunger 3:3', see Fig. 10. The control switch 89 is mounted on the door frarne 25! to be controlled by opening and closing of the door 28 with relation to the usual door jamb. The plunger 94' of the control switch 89 is provided with a beveled surface 94 facing in the direction in which the door 28 is free to be pivoted. Thus, when the door 28 is closed the free edge of the door will ride on the cam surface im and press the plunger 94' irward holding' the control switch 39 in its open position. It is appreciated that the plunger 94' must be nonrotative so that the cam surface 94 will always be in position to be engaged by the free edge of the door 28.

Like 'parts ox" the control switches 81, 88 and 89 are identified on the drawings by the same reference numerals. From Fig. 11, it will be noted that each of the control switches includes a pair of spaced contacts 95 and 98 arranged to be engaged by a contact strip 91 carried by the respective spring plungers 9& or 943' of the switches.

The circut for energiz'ng the coil 'ii of the constant ringing drop 58 includes a lead 98 from the one side of the secondary winding 59 of the transforiner to the terminal 32. Extending from the terminal &3, there is a lead 9% which is connected to the contact 36 of the control switch ai. The other contact ?15 of the control switch 8? is connected to the other end of the secondary winding 59 by a lead me. The Contacts 95 and 95 of the control switches and 89 are connected into the circuit by branch leads 99' and me'. Thus, the control switches S'E, 88 and 89 are conected in parallel in the circuit to shunt one another so that closure of one of those switches is suicient to energize the coil ?i of the constant ringing drop 68.

In the event an unauthorised person attempts to enter the building 21 by opening the door 28 or one of the sashes 3% or 35 of the window 32, the plunger i or 94' of the respective control switch 8?, se or 89 will be immediately released causing that switch to move to a closed position. Current will immediately flow from the secondary winding 59 of the transfornier 51 through the coil 'H of the constant ringing drop ES energizing that coil. Energization of the coil 'ii will draw on the core "92 against the action of the spring pivoting the switch arni %39 past the latch ?e and into engagement with the contact 13. The action of the switch arm Ge is nstantaneous and it will be retained in engagement with the contact 'Ia by the latch arni '56 even in the event the unautho'- zed person should immediately reclose the winy dow or the door through which unauthorized entrance was obtained, resetting the respective control switch B?, 83 or 89 shutting ofi the flow of current through the coil 'ii to release its hold on the core 12.

Before continuing with the description of the main parts of the device, means is provided for determining whether current is flowing in the transforiner and for providing mechanism for pressing inward on the plunger 35 of the constant ringing drop cc to pivot the latch arm ?E against the action of the leai spring 78 to free the switch arm The current flow determining means includes a small six volt pilot larnp !ti which is mounted through the front wall 45 of the main bosi 36 and which is protected from breakage by a seni-circular hood !QE mounted on the front wall d immediately above the lamp Hil, see Figs. 1 and 3.

For turning the lamp lt! on and off there is provided a manually operable switch !03. The switch !03 is slidably mounted in a track !04 to move toward and away from the plunger 8%, see Figs. '7 and 8. The track EM is fixedly mounted to an internal wall of the main box '36 by several screws lim Extending from the switch !93 there is a rotative stem !85 which can be manually turned first in one direction for turnng the switch IDE: on and then in the opposite direction for turning the switch o. The stern [05 is rotatively and slidably extended through a bracl et !66 and a bushing te?. The bracket !GG is secured to the same internal wall of the main box 36 to which the track l i is attached. The bushing lt? is extended through a hole !03, see Fig. 7, formed in the front wall l oi the main box 38. The bushing iii? is retained in position by a nut ece threaded onto the inner end of the bushing and against the inner face of the front wall &5. IvIounted on the outer end of the rotative stern !(35, there is a knurled Knob Hi] by which the stern can be conveniently turned in one direction or the other or by which the stcm can be pressed inward.

An expansion spring Hi, see Fig. 7, sleeves the stern !te and operates between the bracket !Dt and a coliar H?. on the stern for urging the stern axially outward and for in turn moving the switch !BE to a position on the track !M in which the plunger cc is ully extended leaving the latch arm ?6 to be pivoted to its operative position against the pin E? by the leaf spring '58. Thiis, when the stern !25 is pushed axially inward against the action of the coil spring i i i, the switch 533 will he moved along the track %53 1 to push inward on the plunger Referring to Fig. 11, it will be noted that inward movement of the plunger 88 will pivot the latch arm 'it against the action of the leaf spring iii. The bottom end of the lat-ch arni iii wiil be disengaged from the switch arm BQ freeing the switch arin to be raised O the contact ?B by the action of the spring 15.

he circuit for the pilot lamp :ti can 'ne traccd ironi the secondary winding 563 oi' the transiormer 51 along the lead *28 to a lead i connected at one end to the lead se between the secondary winding 55 and the terminal 32 of the constant ringing drop 68. The oti er end of the lead 3 is connected to the lamp li. A lead lid xtends from the other side oi the lanp !ai to one side of the pilot lamp switch sos. A third lead 5 from the other side or" the switch !(23 is connected to the lead ecc between the secondary windng 59 and the control switches, so that the current fiows along the lead t& baci; to the other side of the secondary winding 5& of the transormer 57. Thiis, when the switch it's is in the on position, the pilot lamp !ti will be lit indicating that current is fiowing in the transfcrmer 5?. Normally, however, the switch !83 is left in an "off" position so that the pilot lamp Hil will not he iliuminated all the while one of the master switches 60 and Gi is in the "on" position.

Returning now to the main operation of the alarm system, closing of the switch arin 69 of the constant ringing drop t on the contact iii, as described supra, will control the energization of a six volt relay HE having a coil Hi for moving a core na of magnctic material, see Fig. ll. To complete the circuit for energization of the coil Hi, a lead li extends from the terminal ai of the constant ringing drop 68 to one side of the coil ii?. Extending ironi the other side of the coil I i', there is a lead !29 connected at its other end to the lead IEEE to feed back into the secondary winding 59 oi the transforrner 5?.

The current through the coil i il of the six volt relay l [E can be traced from the secondary winding 59 along the lead 93 to the terminal 62, the lead 85, the switch arm SS, the contact ?a against 9 which the switch arm is closed, the lead ti the terminal ti and the lead ile to one side of the coil ll?. From the coil lil', the current passes through the lead it@ to the lead me and then back to the other side of the secondary winding 59 of the transformer 'i'.

The relay !N has all normally open contacts and the energization of the coil il' raises the core l i& against the action of a spring izi to close all of its normally open Contacts. The spring l'i unctions to hold the core ne, when no current is flowing in the coil l ll', in a lowered incperative position against fixed pins !22.

The normally open contacts of the relay H comprise three sets of ccntacts HEE? and me, i and lt, and i?? and 128, see Fig. il. The core Ma of the relay has an end portion t of insulation material upon which there is mounted spaced contact strips !29, :se and isi. When the coil l i 'i is energized, the contact strip 529 engages the Contacts EES and 52 the contact strip iii@ engages the contacts !25 and 225, and the contact strip i3i engages the contacts il' and 528.

The Contacts 523 and :2:3 and the Contacts 9255 and !25 are connected in pairs by leads tt !33, la t and !355 to the contactors of the switch of the telephone 2@ whose operation is controlled by removal of the hand set 22 from the base 2! of the telephone. The leads !32, iii-3, lat and l are connected to those contactors to shunt that switch of the telephone and establish contact with the central ofiioe of the telephone company with the hand set 22 in position on the base ai That contact i elected by the mere energization of the coil ll? of the relay ne inoving the contact strips lE& and t@ into contact with the pairs of contacts !23 and 524 and me and 52% Closing of the Contacts !El and 528 of the relay i iii controis the operation of other parts of the alarm system to be presently described.

Dialing means is provided for dialing the operator once the circuit to the telephone company has been opened by the engagement of the contact strips !29 and :se with the pairs of contacts !23 and !24 and !25 and l of the relay a:

is mounted within the i lt. The dialing means main box 35 and is characterizecl by a dialing mechanism !se similar in basic Construction to the dialing mechanism 23 of the telephone 2%.

The dialing mechanism 536 is positioned on a support block l, see Figs. and 6, mounted on the bottom wall of the main box 35. The top of the support block il' is rounded to be semi-circular so as to mount the dial mechanism its.

The dialing mechanism !36 is retained in posii ticn on the support block 53'! by means of an inverted U-shapecl metal band 538 which extends over the top of the dialin mechanism and which has its free ends Secured to the sides of the support block 637 by attaching screws !39.

Internally, the dialing mechan'sm !36 includes the usual normally closed Contacts, not shown, which are to be separated by the operation of the dialing mechanism to send out the proper number of electrical impulses corresponding to the portion of a complete turn of the dialing mechanism. Those normally closed contacts of the dial'ng mechan'sm !36 are connected by leads i i& and l li in series with the normally closed contacts of the dialing mechanism 23 of the telephone 25,'. Thiis, either of the dialing mechanisms 2-3 or !36 can be used for dialing purposes when contact with the central ofice has been established.

The dialing mechanism l36 of the alarm sys- 7 contraction spring &57 for 363 or striking one of tem distinguishes from the dialing mechanism 23 of the telephone by the single fact that the usual apertured dialing disc of the dialing mechanism i 36 has been replaced by a single large gear Mi? of approximately the same diameter as the usual dialing disc. The gear MZ is retained in a starting position by the usual spring mechanism incorporated in such dialing mechanisms and is returned to that starting position, after having been rotated, by that same spring mechanisn. The direction of rotation of the gear !42 is inclicated by the arrow A on Fig. 6. The gear Mi is retained from making a complete revolution in the direction of the arrow by the usual stops which arrest the turning of the usual dialing disc.

For rotatin the gear !42 through that portion of a complete revolution through which it isfree to be turned to dial the operator, a small pinion t'i-3 is provided. That small pinion M3 is normally out of mesh with the gear MZ so that the gear MZ is free at all times to be turned back to its starting position by the spring mechanism of the dialing mechaism !36. The small pinion MS is mounted on one end of a shaft !43 which is rotatively and axially slidably supported in spaced bearing brackets !t mounted within the main box 35. The opposite end of the shaft MS carries a gear M which is in mesh with a gear Hit driven by a dial motor !47. The dial motor l ll is fixedly mounted on the bottom wall of the main box 36 and has the gear ME mounted on its driven shaft MS. The gear !45 is of suiicient length to retain engagement with the gear MS in all axial shifted positions of the shaft Ma Thus, it is appreciated that when the motor 54'! is energized the pinion !43 will be turned in the proper direction to turn the gear MZ in the direction of the arrow A.

simultaneous with energization of the dial motor MT, means is provided for shifting the shaft Ult axially in a direction to engage the small pinion MS with the gear !42. That shaft shifting means comprises a solenoid !49, see Figs. 4 to 6 and 11. The solenoid 1:29 includes a coil SEE; which is energized. The end of the core l5l racing the direction in which the core moves when the coil is energized, is formed with an axially extended reduced portion !Bl to which cne end of an elongated arm 552 is adjustably secured by an adjustment screw !53, see Fig. 4. The opposite end of the arm I 52 is bifurcated and engaged with a peripheral groove l l formed about a bushing i secured to the shait !Gt between the bearing brackets Me. The engagement of the bifurcated end of the arm &52 with the groove !5 leaves the shaft ma free to turn at all times. Thus, it is apparent that when the coil !Eli of the solenoid Mi) is energized the shaft Mit Will be moved axially to move the small pinion me 'into meshing engagement with the gear !42 to rotate the same. Movement of the core |5| by :the coil 45@ is arrested by the enlarged portion 'i l formed on the core for striking the adjacent end of the coil when 'the core li has been moved a suicient distance to bring the pinion i i-3 into engagement with the gear l l2.

Operating between the enlarged portion s of the core ii and a fixed pin 556, there is a drawing back on the core l5l when the coil 553 is deenergized to in turn move the shaft Ult back to its starting position. Return movement of the shaft !43 is stopped by a collar lE& formed on the shaft the bearing brackets 144.

Energization of the dial motor !61 and the coil !50 of the solenoid !49 is efected through a 118 volt latching relay !59, see Fig. 11, when the contact strip !al of the six volt 're'lay !IS engages the contacts !21 and !28. The 110 volt latching relay !59 has two sets of normally closed contacts !BD and lE! and 62 and !63 and one set of normally open contacts !64 and !65. The contacts !GB and !BI are normally closed by a contact strip !66 and the Contacts !62 and !63 are normally closed by a contact strip !61. The

contacts !54 and !655, which are normally open, .are arranged to be closed by a contact strip !68. The contact strips !56, !61 and !68 are mounted on the opposed faces of the cross arm !69 of insulation material carried by a core !18 of the latching relay. .A coil IT! engages the core !10 to move the core axially in one direction to similariy move the cross arm !ta to space the contact strips !66 and !81 from the sets of contacts !60 'and Hi! and !62 and !63 opening the same. That movement will also move the contact strip !68 into engagement with the Contacts !64 and !65 closing the same.

Means is provided for holding the core !19 and cross arm !88 in the shi ted position in which the contact strip !58 will be in engagement with the Contacts !6 and !55 when the current in the coil !1! is stopped. That holding means comprises a pivotally mounted latch arm !12 which is urged into an operative position against a stop pin !13 by a small fixedly mounted leaf spring !14. The free end of the latch arm !12 has a cam surface !15 facing the adjacent end of the cross arm !69. Thus, when the cross arm !69 is moved from its normal position by energization of the coil !1!, the end of the cross arm will ride over the cam surface !15 pivoting the latch arm !12 outward against the action of the leaf spring !34.

When the cross arm !69 passes the free end of the latch arm !12, the leaf spring !14 will immediately snap the latch arm back against the stop pin !13 and into engagement with the adjacent face of the cross arm holding it in a position in which the contact strip !68 will be in engagement with the contacts :se and !65. The cross arm !89 and the core !TB are retained in a normal position in which the contact strips !613 and i''! are in engagement with the sets of Contacts !tii and !ti and !62 and !63 by a contraction spring !16.

Movement of the latch arm !12 to release the cross arm !59 to be returned to its starting position by the spring 11& is controlled by a solencid having a coil !11 and a core !18. The core !18 has one end secured to the pivoted latch arm !12 intermediate of its ends so that the moment the coil !11 is energized the core !18 will be moved axially pivoting the latch arm !12 out of engagement with the cross arm !69 and free the same.

The 110 volt circuit for energizing the dial motor !41 can be traced from the plug 53 along the lead &2 through either of the master switches se and 6! and through the lead 36. A lead !13 is connected at one end to the lead 66 and to the contact !Gi of the latching relay !59. Extending from the lead sa, there is a lead !80 which is in turn connected to one side of the dial motor !41. From the other side of the dial motor !41, a lead !8! is connected to the contact !21 of the six volt relay !16. When the contact strip I!!! is closed against the contacts !21 and !28 by energization of the coil !1 of the relay !6, the current passes from the contact !21 through the contact strip !3! to the contact !28. A lead !82 extends from 12 the contact !23 and is connected to the lead 61 between the plug 53 and. the anpliiying circuit 3% of the amplifier. Thus the current for the dial motor !41 fiows back to the plug 53 along the leads !82 and 61.

The 110 volt circuit for ene'gising the coil !53 of the solenoid !49 siinultaneous with energizaton of the dial motor !41 traced froni the plu 53, through the master switch Gi! or 6! then along the lead into the lead !19. From the lead !19, the lead !83 is connected to the contact !t of the latching relay !59 so that the current fiows through the contact strip iii? into the ccntact !52. From the contact !62, a load !85, car-- ries the current into one side of he coil !59. A lead !85 extends from the other side of the coil !511 and connects with the lead !iii between the dia! motor 31 and the contact !21 of the relav HE. Thus, the current from the coil !53 ows along the lead me, the lead !iii into the contact !21. When the contact strip sa; is closed against the contacts !21 and !28, the current :vs from the contact !21 through the contact :tnp !ti to the contact !28, along the lead !82 and lead 61 back to the lug 53.

Thus, it is apparent that when the contact strip !3! is closed against the contacts !21 i hy energization of the coil i!? of the reiay i !8 both the dial motor !41 and the sclenoid M will he energized to cause the gear !az of the mechanism !35 to be turned through that portion of a complete revolution that the gear is free to be turned to dial the operator.

Means are provided, controlled the gear as it approaches the end of that portion of a complete revolution that it is free to he turned through, for de-energizing the solenoid m and the dial motor !41 to free the gear i-2 to he turned back to its starting position by the s mechanism contained within the dialing m nisni EES. That de-energizing means COUPS-.7 a snap action switch !86 which can be ny normally open microswitch mounted within the main box 35 closely adiacent the gear !42. Pro jecting from the face of the gear 32 there a pin !81. The switch !86 is provided with exible blade se:) projected into the path of the pin !81 to be engaged by the pin to moment l close the normally open switch !556 to pass elcctrical current. The pin !81 is so nounted on the gear !42 with relation to the free end of blade me, that the pin will not contact the hlado !88 until the gear !42 has nearly completed that portion of the complete revolution through which the gear is free to be turned.

It is the normally open switch !853 which controls energization of the coil H! of the latching relay !53 to move the core !10 and the cross arm !59 to move the contact strips !St and !31 out of engagement with the Contacts !50 and !SI and !52 and !63 to de-energize the dial motor !41 and the solenoid 59. The circuit for the coil !1! can be traced from the plug 53 along:: the lead 62 through either the master switch E& or 6! and along the lead 55. Extended from the lead 56, there is a lead !89 which feeds into onc side of the coil !1i. From the other side of the coil !1!, a lead !90 connects to one side of the switch !86. A lead l extends from the other side of the switch !t and connects to the lead !85 between the solenoid !49 and the lead !GL Thus, the current can be traced from the other side of the switch !35 along the lead !SL the lead !85, the lead !Bi and back to the plug the same as for the dial motor !41 and the solenoicl MS. It being appreciated, of course, that the contact strip !ti of the relay l !G must be in engagement with the oontacts 52'! and |23 before the closing of the normally open switch !83 can energize the coil i'll of the latehing relay i. Engagement of the pin 58'! carried *by the gear !t with the blade !88 of the normally open switch !Eit will cause the switch to be momentarily closed to energize the coil ill of the latching relay REE. The action will be to immediately move the contact strips [55 and !ti away from the Contacts !653 and !ti and !52 and !53 to de-energize the dial motor l l'l and the solenoid Me. Immediately, the small pinion Ms will move out of engagement with the gear i i-2 and that gear will be returned to its starting position completing the dialing of the operator. Notwithstanding that the pin ii'l moves away from the hlade t& releasing the switch lil@ to snap back to its open position deenergizing the coil ili, the cross arm !66 of the latching relay 559 will be retained in its moved position in which the contact strip !68 closed the contacts !ti l and !535 by the latching arm !l z as previously described.

Engagenent of the contact strip 58 with the Contacts i and 185 will cause the turntable drive motor 39 of the amplifier %i to be energized to turn the turntable iti and cause the oontinuously recorded message of the record il to be played through the amplifying circuit 38 of the anplifler ti and through the transmitter of the telephone E@ to the operator of the een tral office of the telephone company. To accomplish that, the output transformoi', not shown, of the ampliiying circuit 38 of the amplifier S'i is connected by leads !52 and !93 to the transmitter of the telephone 20.

The circuit for energizing the turntable drive motor Eit] can be traced from the plug 53 along e the lead 52 through either of the master switches %8 and ti, the lead the lead [89 and a lead il i to the contact it i of the latching relay Il. When the contact strip its is closed 'against the contacts Hi l and !55, the current flows from the contact it@ through the contact strip !53 into the contact itl. A lead !95 extends from the contact !55 to one side of the turntable motor 353. Extending from the other side of the turntable motor there is another lead !3% which is connected to the lead !85 at its junetion with the lead Hil. Thus, the current from the other ide the motor 39 ows along the lead !s into the lead 565 and then back to other side of the plug the as for the dial mo tor Mi' and the solenoid m). Again. for energisation of the turntable motor 35 to ?oe effected, it is necessary that the contact strip !ti of the relay ti@ he closed against the contacts !27 and ass as previously described.

When the turntable motor is energized the recorded message will be repeated to the telephone company operator over and over `again until the police arrive to apprehend the person making an illegal entry and to shut ofi the alarm system. Following the apprehending oi the intruder, the police can *quickly shut off the alarm system by turning "oli" the one of the master switches E@ or Gi which is in the "on" position, if they have a key supplied by the tenant of the building. However, if no key is available, the entire alarm circuit can be disabled by first reclosing the open window or door through which the intruder passed to reopen the respective control switch si', 38 or 89. Then,

' of the plug 53.

'the knob I l 0 is pushed inward to slide the switch !03 to 'push inward on the plunger of the constant ringing drop 68. Inward movement of the plunger aa will pivot the latch arm l to free the switch arm 69 to be raised off the contact 18. Immediately, the circuit, through the 'coil ill' of the relay liti, will be broken deenergizing the relay i IE. De-energization of the relay !lt will free the contact strips !29 and 531? to 'be moved away from the pairs of contacts !23 and !24 and !25 and !25 breaking the circuit to the telephone company. *Simultaneouslm the contact strip isi will move away from the contacts !21 and m breaking the circuits to the turntable drive motor 39 and to the coil I'H of the latching relay. The alarm system will then be disabled.

When the circuit to the coil ll! of the latching relay !59 is broken the core :na is not moved back to its starting position by the spring !75 because oi' the action of the pivotally mounted latching arm !12. To free the core fli! and in turn the cross arm !69 to be moved back to their starting position in which the contact strips !se and !67 are engaged with the pairs of contacts !50 and l-Ei and !62 and !63, it is necessary to energize the coil i'll. Energization of the coil ill' is effected by a release button !S'i which is mounted through the front wall 45 of the main box 38, see Fig. l. As shown in Fig. ll, the release button !91 is a conventional spring pressed push button having normally open contacts !S and 1539 arranged to be bridged by the contact strip %to when the release button !97 is manually pushed inward.

The circuit for the coil ill can be traced from the plug 53 along the lead 62 through either of the master switches 60 or si the lead 53, the lead 56 and the lead !19. From the lead FES, a lead zili is connected to the contact i93. When the contact strip 28@ is engaged with the ccntacts 98 and [99, the current will flow from the contact i98 through the contact strip 29@ to the contact !99. A lead 2632 is connected to the contact I 99 and has its other end connected to the coil i'll at one end thereof. Extending from the other end of the coil !71, there is a lead 203 which is connected to the lead 67 between the amplifying circuit 38 and the plug 53. Thus, the current -ows ironi the other side of the coil ill' through the lead 2633 and the lead 67 back to the other side Energization of the coil i'll, of course, requires that one or the other of the master switches l or El be in the "on position. When the release button !S'i is pusheol inward, the coil ill will be energized to draw on the core HE: and pivot the latch arm i 72 against the action of the leaf spring i'm to free the cross arm !59 and core I'm to be moved back to their starting position by the spring il. When the push button !97 is again released, the coil I'll will be oleenergized freeing the latch arm !12 to be returned to its starting position against the stop pin !lt by the leaf spring i M.

The leads !32, !33, li i, !35, ll, Mi, 592 and .133 where the exit from the main box 36 through the terminal box 5@ are embodied in the cable 54 which carries those leads to the interior of the telephone 28 where they are connected to their respective parte of the telephone circuit.

It is thought that the entire operation of the alarm system for advising the telephone operator of the attempt at burglary and the request that the police be dispatched will be apparent from the foregoing description without further ex- '15 planation. From the description, it 'is apparent that the present invention provides a novel alarm system which is completely automatic in its operation and which in no way interferes with normal operation of the telephone ai) regardless of whether the alarm circuit is turned on or not.

In Fig. 12, there is illustrated a thermostatically operated switch 204 which can be substituted together with a number of like switches in the alarm system described in connection with Figs. l to 11, in place or" the control switches 81, 88 and 89 for converting the system into a fire alarm system.

The thermostatic switch l includes a base 205 of insulation material upon which spaced netallic Contacts EES and 261 are mounted by means of attaching screws 288. The ends of the leads 59 and ili@ which control energization of the coil 'H of the constant ringing drop 68 are connected to the contacts 2555 and by means of screws 2%. Secured to the contact 281, there is a bi-metallic strip ili@ which has its other end spaced from the contact 29'?. However, when the temperature within the building 27 rises excessively, as when a fire breaks out, the bi-metallic strip will iex into engagement with the contact EM and complete the circuit to the coil 'li of the constant ringing drop 68 setting the alarm system in operation exactly as described in connection with the control switches si, 88 and 89.

The Contacts 203 and 2%? and the bi-netallic strip 21% are protected by a cover 2l2 which is Secured to the base 295 by several removable screws 2 l l. The ends of the cover 212 are formed with slots 2 !3 through which the leads 99 and EGD extend permitting the cover Z l 2 to be mounted in position even when those leads are connected to the Contacts 233 and 201. The main wall of the cover '2:2 is forined with perforations 2% for permitting a free circulation of air about the bimetallic strip 2 i ii.

When the alarm system is functioning as a fire alarm system, the record i! will carry a different continuously recorded message from that described in connection with the first form oi" the invention. The message of the record 4! for the fire alarm *stern could be as follows:

My name is John Q. Public and I reside at 423 Park Avenue, New York city. My home is on fire; please advise the fire department.

In all other respects, the operation and construction of the alarm system when functioning as a fire alarm system is exactly as described in connection with Figs. 1 to li when the system is iunctioning as a burglar alarm system and like reference numerals are used throughout to identify like parts.

From the ioregoing description, it is apparent that the present invention proposes completely automatic alarm system which can be used to operate on normally closed or open control cirv cuits and may be used in connection with any type of doors, windows, safes, Vaults, closets and at any other place for safekeeping valuables.

While I have illustrated and described the preerred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and nodifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

1. An alarm system for connection to a telephone having a dial mechanism, a transrnitter, and a switch for controlling connection of the telephone with a central ofiice when the hand set of the telephone is lifted comprising a step-down transformer, said transiormer having a prinary winding and a secondary winding, said primary winding being connected to a household source of power, a recording unit, said recording unit including an amplifying circuit having an input and an output, the input of said anpliying circuit being connected to said household source of power in parallel with the primary windng of said transformer, the output of said anplifying circut being connected to the transmitter of the telephone, said recording unit further including a drive motor, and means operable by said drive motor for transmitting a recorded message to said amplifying circuit, a first coil connected in series with said secondary windin of said transformer, a first core located within said first coil, a first switch connected to said first core, spring means for normally maintaining said switch in an open position, said first core being adapted to move longitudinally through said first coil when the latter is current activated and to close said first switch, a plurality of control switches connecting said first coil with said secondary winding of transiormer, said control switches being connec ed in parallel with each other whereby closing any one of said switches will current-activate said first coil, a second coil connected in series With said secondary winding of said transormer and said first switch, a second core located within said second coil, a pair of switches connected to said second core, second spring means 3 for normally maintaining said pair of switches in an open position, said second core being adapted to move longitudinally through said second coil when the latter is current-activated and to close said pair of switches, said pair of switches being i connected in Shunt of the switch of the telephone whereby to establish contact with the central oiiice without lifting the handset, a third switch connected to said second core and adapted to be maintained in an open position by said second spring means, dial means including a dial mechanism connected in series with the dial mechanism of the telephone for dialing the operator when contact is established with the central oice by said pair of switches, said second core being further adapted to close said third switch when said second coil is current-activated, and means ope'able by the closing of said third switch for first Operating said dial means and then operating said drive motor to transmit said recorded message to the operator through the transmitter of the telephone.

2. An alarm system for connection to a telephone having a dial mechanism, a transmitter, and a switch for controlling connection of the telephone with a central office when the hand set of the telephone is lifted comprising a stepdown transformoi', said transformer having a primar-y winding and a secondary winding, said primary winding being connected to a household source of power, a recording unit, said recording unit including an amplifying circut having an input and an output, the input of said amplifying circuit being connected to said household source ox power in parallel with the primary winding of said transformer, the output of said amplifying circuit being connected to the transmitter of the telephone, said recording unit further including a drive motor, and means operable by said drive motor for transmitting a recorded .message to said amplifying circuit, a first coil connected in series with said secondary winding of said transormer, a first core located within said first coil, a first switch connected to said first core, spring means for normally maintaining said switch in an open position, said first core being adapted to move longitudinally through said first coil when the latter is current activated and to close said first switch, a plurality of control switches connecting said first coil with said secondary winding of said transformer, said control switches being connected in parallel with each other whereby closing any one of said switches will current-activate said first coil, a second coil connected in series with said secondary windin of said transformoi' and said first switch, a second core located within said second coil, a pair of switches connected to said second core, second spring means for normally maintaining said pair of switches in an open position, said second core being adapted to move longitudinally through said second coil when the latter is current-acti- Vated and to close said pair of switches, said pair of switches being connected in shunt of the switch of the telephone whereby to establish contact with the central ofiice without lifting the handset, a third switch connected to said second core and adapted to be maintained in an open position by said second spring means, dial means including a dial mechanism connected in series with the dial mechanism of the telephone for dialing the operator when contact is established with the central ofiice by said pair of switches, said second core being further adapted to close said third switch when said second coil is ourrent-activated, and means operable by the closing of said third switch for first Operating said dial means and then Operating said drive motor to transinit said recorded message to the operator through the transmitter of the telephone, and a master switch connecting said primary winding of said transformer and said input of said amplifying circuit to said household source of power whereby to control energization of said`transformer and said amplifying circuit, and a second master switch connected in Shunt of said first master switch, said master switches being keyoperated.

3. al m system for connection to a telephone having a dial mechanism, a transmitter, and a switch or controiling connection of the telephone with a central office when the hand set or" the telephone is lifted comprising a step-down transformer, said transforrner having a primary winding and a secondary `winding, said primary winding being connected to a household source of power, a recording unit, said recording unit including an amplifying circuit having an input and an output, the input of said amplifying circuit being connected to said household source of power in parallel with the primary winding of said transiorrner, the output of said amplifying circuit being connected to the transmitter of the telephone, said recording unit further including a drive motor, and means operable by said drive motor for transmitting a recorded message to said amplifying circuit, a first coil connected in series with said secondary winding of said transformer, a first core located within said first coil, a first switch connected to said first core, spring means for normally maintaining said switch in an open position, said first core being adapted to move longitudinally through said first coil when the latter is current activated and to close said first switch, a plurality of control switches connecting said first coil with said secondary winding of said transforner, said control switches being connected in parallel with each other whe'eby closing any one of said switches will current-activate first coil, a second coil connected in series with said secondary winding of said transformer and said first switch, a second core located within said second coil, a pair of switches connected to said second core, second spring means for normally maintaining said pair of switches in an open position, said second core being adapted to move longitudinaliy through said second coil 'when the latter is current-activated and to close said pair of switches, said pair of switches being connected in shunt of the switch of the telephone whereby to establish contact with the central office without lifting the handset, a third switch connected to said second core and adapted to be maintained in an open position by said second spring means, dial means including a dial mechanism connected in series with the dial mechanism of the telephone for dialing the operator when contact is established with the central ofiice by said pair of switches, said second core being furtheradapted to close said third sv itch when said second coil is current-activated, and means operable by the closing of said third switch for first operating said dial means and then operating said drive motor to transmit said recorded message to the operator through the transmitter of the telephone, and means for holding said first switch in closed position even when said control switches are reopened and current is no longer fiowing in said first coil, and release means for said holding means including a slidably mounted plunger in operative engagement with said holding means, a pilot lamp connected in series with said secondary winding of said transformoi', a pilot lamp switch connecting said pilot lamp to said secondary winding, said switch being slidably mounted at the free end of said slidably mounted plunger of said release means, and means for moving said pilot lamp switch to push inward on said plunger and operate said release means to free said first switch, said last mentioned means being adapted to open and close said pilot larnp switch.

4. An alarm system for connection to a telephone having a dial me'chanism, a transmitter, and a switch for controlling connection of the telephone with a central ofiice when the hand set of the telephone is lifted comprising a step-down transformer, said transformoi* having a primary winding and a secondary winding, said primary winding being connected to a household source of power, a recording unit, said recording unit including an anplifying circuit having an input and an output, the input of said amplifying circuit being connected to said houschold source of power in parallel with the primary winding of said transformer, the output of said amplifying circuit being connected to the transmitter of the telephone, said recording unit further including a drive motor, and means operable by said drive motor for transmitting a recorded message to said amplifying circuit, a first coil connected in z being adapted to ?series with:said secondary windingof;saiditrans- 'former,'a;rst 'core located within said. firstcoil, tafirst switch 'connected to said first core, spring .means for normally maintaining said switch in an open position, saidfirst core being adapteo to move longitudinally through said first coil when i theilatter is current-activated and to close said rss, switch, a plurality of control switches connecting .said first coil with said secondary winding of said transforner, said control switches being connected in parallcl with each other 'whereby closing any one of said switches will 'current-activate first coil, a second coil connected in series with said secondary winding of said transforn er and said first switch, a second core located within said second coil, a pair of switches connected to said second core, second spring means for normally inaintaining pair of switches in an open position, said second core nove longitudinally through said second coil when the letter is current acti- Vated and to close said pair of switches, said pair 'of' switches being connected in Shunt of the switch of the telephone Whcreby to establish contact with the central ofiice without lifting the handset, a third switch connected to said second core and adapted to be maintained in an open position by said second spring means, dial means including `a dial mechanisrn connected in series with the dial mechanism of the telephone for dialing the operator when contact is established'with the central office by said pair of switches, said second core being further adapted to close said third switch when said second coil is current-activated, and means operable by the closing of said third switch for first Operating said dial means and then Operating said drive motor to transmit recorded message to the operator through the transrnitter of the telephone, a turnable gear secured to said dial mechanisn of said dial means,

r a dial, motor, and a small pinion gear driven by said motor and adapted to mesh with said turn" able gear whereby to operate said dial mechanism to dial the operator, said small pinion gear being normally out of mesh with said turnable whereby said turnable gear is free to bo turned back to its starting position, and means for moving said small pinion' gear into engagement with said turnable gear including a solenoid,

said means operable by the closing of said third switch including a latching relay having two sets -of normally closed Contacts through which said dial motor and said solenoid are current-activated when said third switch is closed, said latching relay further having a set of normally open contacts controlling operation of said drive motor, a third coil connected in series with said third switch, a third core located within said third coil, a cross -bar connected to said third core, said normally closed contacts and said normally open Contacts being in operative engagement with said cross bar, said third core being adapted to move longitudinally through said third coil when the telephone with a central'ofce when the hand set -of the telephone isliftedcomprising a step-down transforrner, said: transformoi'. having` a primary winding and asecondary winding, said primary wincing being connected to a household source of power, arecording unit, said recording unit including an ampliiying circuit having an input and an output, theinput of said arnplfying circuit being connected to said househcld source of power 'in parallel with the prinary winding of said transfcrmer, the output of said amplifying circuit being connected to the transrnitter of the telephone, said recording unit further including a drive motor, and means operable by said drive motor for transmitting'a recorded message to said ampliying circuit, a' first coil connected in series with said seconclary winding of said transformer, afirst core located within said first coil,

a. firstswitch ,connected to said first core, spring -meansior normally maintaining said switch in 'anopen position, said first core being adapted'to "move longituclinallythrough said first coil when :the letter is current-activated and to closesaid first switch, a plurality of control switches connecting said first coil with said secondary wind ingof said transformer, said control switches being connected in parallel with each other Whereby closing' any one of said switches will current-activate said first coil, a second coil connected in series with said secondary winding of said. transformer and said first switch, asecond core located within saidsecond coil,'a pair of switches connected to said second core, 'second spring'means for normally maintaining said pair 'of switches' in an open position, said second core sing adapted to move longitudinally through said second coil when the latter is 'current-activat-ed and to close-said pair of switches, said pair of switches being connected' in shunt of t e switch of the telephone whereby to establish contact with the central' office without lifting the handset, a third switch 'connected to said second core and i adaptcd to .be'maintained in an open position by said second springrmeans, 'dial-means including a dial' mechanism connected in series with the dial. mechanismof the telephone for dialing the operator when contact is established' with the central ofce by 'said 'pair oi'switches, said-second core being further adapted'to close said third switch when said second coil is current-activated, and means operable by the closing of said third switch for 'firstroperating said 'dial'rneans and then Operating said drive motor to transmit said recorded message'to the operator through the transmitter of the telephone, spring 'pressed plungers carried by said control switches and being of the type to normally'clcse said switches, said switches being mounted to be held'in the open position by a closed door or window pressing said plungers, said control switches being' normally open, thermostatically controlled switches arranged tobe closed byan excessive raising of the :temperature of the air surrounding said switches.

CARSTEN J. MUNCH.

'liteferences'Cited in the' file of this patent UNITED STATES'PATENTS Number Name Date 1,614275 Bruhn Jan. 11, 1927 1,976,296 Resnick Oct. 9, 1934 2,099,913 Tuscher et al Nov. 23, 1937 2,161,525 Mountstephen June 6, 1939 2,469278 Sears May 3,'1949 2,479521 .Jackson Aug.'231949 2,498,613 'Talbot Feb. 21, 1950 

